Nginx Learning Note--choosing an outgoing IP Address

Original address: https://www.nginx.com/resources/admin-guide/reverse-proxy/
Original title: Choosing an outgoing IP Address

If your proxy server has multiple network interfaces, sometimes you may need to select a specific source IP address to connect to the proxy server or the upstream server. This configuration can be useful if a proxy server behind Nginx is set to accept connections only for a specific IP network or IP address range.
If your proxy server has several network interfaces, sometimes the might need to choose a particular source IP address for Connecting to a proxied server or an upstream. This could be useful if a proxied server behind NGINX are configured to accept connections from particular IP networks or IP Address ranges.

Specify proxy_bind the directive and set the IP address of the network interface:
Specify the proxy_bind directive and the IP address of the necessary network interface:

/app1/ {    127.0.0.1;    http://example.com/app1/;}

/app2/ {    127.0.0.2;    http://example.com/app2/;}

The IP address can also be specified with a variable. For example, a $server_addr variable passes the IP address of the network interface that receives the request.
The IP address can also specified with a variable. For example, the $server _addr variable passes the IP address of the network interface that accepted the request:

location /app3/ {    proxy_bind$server_addr;    proxy_pass http://example.com/app3/;}

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